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Commitments and Contingencies - Schedule of Spent Nuclear Fuel Obligation (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Spent Nuclear Fuel Obligation [Line Items]    
Spent nuclear fuel obligation $ 1,296 $ 1,230
Former ComEd units    
Spent Nuclear Fuel Obligation [Line Items]    
Spent nuclear fuel obligation 1,158 1,100
One time fee 277  
Fitzpatrick    
Spent Nuclear Fuel Obligation [Line Items]    
Spent nuclear fuel obligation 138 $ 130
One time fee $ 34